$\frac{3x^2+25x+24}{x+7}$
$4ab-6b^2$
$\lim_{x\to+\infty}\frac{e^x+e^{-x}}{e^x-e^{-x}}$
$2x+18=6y$
$\int6x\:cos\left(7x\right)dx$
$64m^2n^2-10xm^2n^2$
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